Paper-pulp machine.



, F. H. HOBERG.

PAPER PULP'MACHI'NE. APPLICATIONFJLED DEC.1. \916.

1,274,0 1 1 Patented July so, 1918.

Firm/K H Hom N VENToR.

ATTORNEY.

paper.

I suction is aetingon the screen of the cylinrnanx'n. nonn'ne, or GREEN BAY, Wisconsin;

PAPER-PULP Macnnm Specification of Letters Patent.

Patented July 30, 1918.

' Application filed December 1, 1918. Serial No. 134,361.

To azzwhommymm-i 'Be it known that LgFnANK H. Homine',

a citizen of the United States of America,"

residing at Green Bay, in the county of Brown and State of Wisconsin, have invented certain new and useful Improvements in Paper-Pulp Machines, of which the following is a specification, reference being had therein to the accompanying drawing.

The invention relates. to pulp machines,

and especially to that class of machines which are used in the manufacture of tissue It is an object of the invention to prolong the life of the conveying belt which carries the sheet of pulp through pressure rollers.

A further objectconstitutes the increase of the thickness of the conveyer belt at the point where suction is generated, so'that the pulp fibers arenot influenced due to the negative pressure. l

A further object is to prevent impressions on the sheet of pulp while being pressed from the cylinder onto the conveying belt. Other objects ;w il1 become more apparent by, reference t e -the specification and the claims. In the drawings,

Figure 1 is a central longitudinal section of the operative end of a cylinder mold maclliine, to which the invention has been app ied. f

Fig. 2 is a diagrammatic viewdisclosing the arrangement of the belt and of the rollers.

Referring to the drawings, :1 designates the bed plate of the machine upon which the supporting frames 2 and '3, comprising a pair of oppositely disposed standards, are arranged. At the rear end of the machine a vat 4 containing the pulp is arranged, in

which a cylinder 5 is rotatably secured so as to immerse with approximately one half of 1 its. periphery into the pulp mass. The cyl inder is hollow and its periphery is formed by a screen 6 of fine mesh so as to permit passage of the liquid which is separated from the ulp while it is pressed onto the conveyer belt 10 of felt, or other suitable material. In order to drain off the water, the cylinder or mold 5 is provided at one end with an outlet 8, which is arranged so as to keep the level of the pulp containing liquid in the receptacle 4 slightly above the level of the water 7 in the cylinder. From the foregoing it is obvious that a constant der, which causes the pulp fibers 9 contained in the liquid 9 to adhere to the cylinder mold 5. In the rotation of the cylinder the layer of pulp adheringthereto enters into engagement with, and is pressed to,- the conveyer belt 10, which is trained around a couchroll 11, suitably journaled above'the mold cylinder. The conveyer belt 10 together with the pressed sheet 10 of pulp travels in the direction indicated by arrows in Fig. 2, to bring the pulp layer between pressure rollers, 12 and 13, the'latter of which is yieldingly forced into engagement with the roller 12 which is stationary and is driven from a suitable source of motive power. The sheet of pulp 10*, passing between these pressure rollers, loses its moisture and leaves the rollers in a comparativelydry state. Between the upper and "the lower .run of the "conveyer belt a second belt 14, preferably, but not necessarily, of felt, is. arranged which' is trained around the couch roll 11, and a roller 15 suitably mounted in journals provided on' the frame standards 3. This belt, which'is thicker than the conveyer belt, is. suitably guided bv idlers 16, 17 and 18, which engage the lower sides of the u per and lower run,

respectively, to maintain a'predetermined tension of the belt. As will be readily seen from the drawings, the rear part of the secondary belt 14 is in engagement with the inner side of the conveyer belt 10 and trav els with the same in unison, the movement of the secondary belt being effected merely by friction. A plurality of tension devices 19, arranged in suitable bearings on the frame standards 3 servev for adjustment of the secondary belt to take up slack, whereby slippage between the secondary belt and the y conveyer belt is,avoided. As will be seen-- from the drawings, the conveyer belt is trained around a plurality of idlers 20 and 21, and passes between pressure'rollers 22 and 23, so as to remove moisture contained in the conveyer belt rior to its passing around the couch roll 11. Between the idlers 20 and 21, a-whipper 24 is provided. Asuction box 25 is supported between the couch roll and the idler 16 in a suitable manner by .the frame standards 2 to draw the moisture from the pulp sheet. The suction box 25 comprises a casting 26 and is closed at its top by a board 27. The casting ex tends the full width of the belt and the board 27 is provided with a longitudinal slot 28.

belt is therefore greatly enhanced at the portions where it is in engagement with the secondary belt, with the result that the pulp pressed thereonto does not receive any felt marks when applied to the belt by the drum 5.- In addition, the suction device acts through a double layer and its destructive eifect upon the pressed fibers of sheet of pulp is greatlv reduced, if not entirely eliminated.

I am aware that various changes or'modifications may be made without departing from the spirit of the invention, and I want to avail myself of such departures Which fairly fall within the scope of my invention, as pointed out in the following claims.

I claim:

1. In a machine of the character. described, a receptacle containing pulp, a drum journaled in said receptacle, a felt belt passing over said receptacle, said drum being adapted to press pulp onto said felt belt, means for increasing the thickness of portions of the belt to cushion pressure exerted between said drum and said felt belt,

and means for removing moisture from said pulp through said increased portion of the belt.

'2. In a machine of the character described, a receptacle containing pulp, a drum journaled in said receptacle and partly immersed in the pulp, a felt belt trained to contact with the periphery of said drum, means for rotating said belt, means arranged within said belt for increasing the thickness of portions thereof to cushion pressure exerted between said drum and said felt belt, and means for removing moisture through said increased portion of the belt.

3. In a machine of the class described, a receptacle containing pulp, a felt belt passing over said receptacle, a drum journaled in said receptacle and adapted to press a shee; of pulp onto said belt, a second belt engag ing a portion of said first named belt to cushion pressure between said drum and said first named belt, and means for removing moisture from said sheet of pulp through both of said felt belts.

4. In a machine of the character described, a receptacle containing pulp, a belt passing over said receptacle, a drum journaled in said receptacle and adapted to press a sheet of pulp onto said belt, a second felt belt arranged between the upper and lower runs of said first named-belt and engaging a portion thereof to cushion pressure between said drum and said first named belt, and suction means for removing moisture from said sheet of pulp through both of said belts.

5. In a machine of the character described, a receptacle containing pulp, a felt belt passing over said receptacle, a drum journaled in said receptacle and adapted to press a sheet of pulp onto said belt, suction means for removing moisture from said sheet of pulp, and means for increasing the thickness of said belt over said suction to protect the pulp sheet against the influence of the suction.

6. In amachine of the character described, a receptacle containing pulp, a drum journaled in-said receptacle, a couch roll arranged over said drum, a felt belt trained around said couch roll, said drum adapted to press a sheet of pulp onto said belt, a second felt belt arranged within said first mentioned belt moving in unison therewith in engagement with a portion thereof to protect the pulp sheet against pressure between said couch roll and said drum, and suction means arranged to remove moisture from said pulp sheet through both of said belts.

In testimony whereof I hereunto affix my signature.

FRANK H. HOBERG. 

